There may be a problem with fan motor,but i believe your problem may be the rotory switch that controlls voltage to fan motor,to check this pull knobs off front ,then remove filter from back,there are 4 screws in bottom of case remove these,pull unit out carefully .there are 5 wires conected to unit ,two for fan 2 for on off switch,1 for ground just what wires go were,then disconnect wires from there posts,and pull unit out of box,find the two wires that go fan,snip wires that go to the circiut board leaving enough space to rewire after test get extention cord and snip off to make direct plug to fan to wall connect extention to the two wires from the fan motor and wire nut or tape so no short,pug extention cord into wall outlet if fan runs on a high rpm or max power,then your rotory switch is no good and you can install an external rotory switch on side of unit,if fan does not run any faster then your fan motor needs replaced,let me no if you need more help
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